Breezemerchant

UPDATE: Bled the system so coolant is flowing once again. Same issues as before with no fans kicking in so I guess all it could be is the fan itself or the relay. Really annoyed at the time and money spent on this - have pretty much changed every other cooling part except the water pump (which I have bought but will send back). Hopefully have a fully working car for the wife soon though.

Ok - very defeated this evening. Replaced the thermo switch and thermostat and sensor. Plugged the fan back in and nothing. the water pump is definitely pumping as there is flow back into the reservoir. I can hear that there is loads of air in the system as a result of the work and the radiator and thermo switch are not even warm when the car starts to overheat. any tips on the best was to bleed the system?? I’m starting to lose the will Breezy - starting to think you might be right regarding the fan itself. :/

Legend - that's good to know!

That's great, I'll check it out whilst I'm replacing the thermoswitch when it arrives. I may just replace the water pump as I already have a new aux belt to go on as current one is fraying slightly and found a brand new FAI pump for £25 on ebay. It all looks pretty straightforward and accessible from the side. Then the cooling system will then be renewed apart from the radiator and fan

Ah that's good to know - What I noticed was that the revs increased and decreased when switching the AC on/off and assumed there was a clutch. Would the revs still adjust if the refrigerant was low? HVAC Codes are: 65535 - Internal control Module memory error 01596 - Motor for recirc/outside air flap no voltage 00898 - AC control circuit open or short to plus I believe the engine is an AZQ (but will confirm) and I also thought that coolant flow past the fan thermoswitch could be the issue - hopefully the new thermostat will resolve that if it is. It has 95k on the clock. Could it also be the waterpump?

Update: the switch i ordered was the wrong one, ordered the correct one. breezey - no low pressure code, just ones regarding the circuit shorting etc. the clutch kicks in so would expect the fan to work? As a makeshift I shorted the switch so the high speed comes on straight away. Took the car for a long blast and no issues at all. Car is running perfectly and the check engine light has gone! Maybe cleared out all the poop from running lean an idling so much testing the car. I also ordered a new thermostat and sensor, when all parts are fitted i will clear codes, drive and then re-scan with another update. thank you

ok so: 16687 - misfire 3 16490 - manifold/barometric sensor Implausable 16556 - Fuel trim Bank 1: system too rich 16685 - misfire 1 16684 - random misfire 16686 - misfire 2 17524 - lambda sensor heater open circuit 01598 - Battery voltage low also noticed: 01314 - ECM DTC memory and there are loads of other HVAC ones too but not sure they are related.

OK so the fan works at both speeds. I have a replacement Febi thermoswitch - will replace that now. What are your thoughts?

*Only has 1 fan as far as I could see - I'll double check shortly.

Thanks for the pic that's really helpful - will check this in half an hour after work. I forgot to mention that the hose was indeed split at both ends. I have replaced it with a chunky bit of silicone hose which is strong enough not to cave in and checked for vacuum leaks as best I can by ear. Still no bueno and misfiring when hot.

Hi Breezy, No - I never noticed it go above 90 but the car starts misfiring around the time you would expect it to. I did notice burning coolant steaming from the sensor attached to the radiator. And yes - I checked all of those fuses too. Should I run 12v directly to the fan to test if its toast?

Hello everyone, this is my first post on this amazing forum which has helped me so much over the years with my wife's Mk1 2005 Fabia 1.2 HTP 12v. The above car is giving me a lot of trouble currently, (and so is the Mrs.) Car started misfiring on all cylinders when hot and go into limp mode, not going past 2k RPM. I replaced spark plugs and coils but the car still started misfiring when hot. Scanned the car and got fault codes for all cylinder misfires, as well as pretty much every other sensor in the car including both o2 sensors & MAP sensor. Also has code for low battery voltage even though its fine when tested with a multi-meter. I charged the battery just in case, and replaced both o2 sensors. I am still getting the same codes after clearing. What I then realised is that at no point when getting the car to misfire when hot, had the fan kicked in. I turned on the AC and left the car running until it got to temp and still no fan. Checked the fuses near the battery - all are good. My question is, could a faulty fan be the culprit here? Could an overheating engine as a result of a faulty fan cause all cylinder misfires and throw up tons of codes? Thank you in advance for any help you can give! Ryan